Pb2Al2Si2O9 Dorsam G, Liebscher A, Wunder B, Franz G American Mineralogist 93 (2008) 573-583 Crystal structures of synthetic melanotekite (Pb2Fe2Si2O9), kentrolite (Pb2Mn2Si2O9), and the aluminum analogue (Pb2Al2Si2O9) _database_code_amcsd 0004537 6.8981 10.6906 9.7413 90 90 90 Pbcn atom x y z Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Pb .45060 .30435 .54954 .0123 .0137 .0153 .0079 -.0010 -.0006 -.0001 Al1 .5 0 0 .006 .0050 .0104 .0021 -.0001 -.0003 .0014 Al2 .5 .1467 .25 .007 .0066 .0108 .0027 0 -.0012 0 Si .2171 -.0883 .2488 .007 .0053 .0129 .0036 .0005 .0001 -.0009 O1 .3477 .0082 .3372 .008 .0079 .0142 .0032 .0005 .0009 -.0006 O2 .3080 -.1068 .0965 .011 .0147 .0138 .0038 -.0021 .0031 -.0039 O3 .1854 -.2260 .3169 .009 .0080 .0103 .0096 .0007 .0013 -.0036 O4 0 -.0227 .25 .010 .0049 .0077 .0180 0 -.0007 0 O5 .6096 .1410 .4230 .008 .0066 .0122 .0038 .0007 -.0018 -.0013